Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Often Mistaken For Obsidian Or Mineral) in the encyclopedia
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Topaz
Topaz (Al2SiO4(F,OH)2)
Mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Red Jasper (Mahogany Obsidian variant similarity)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Brown Jasper (Likely)
Jasper (Cryptocrystalline Silicon Dioxide - SiO2)
Mineral
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Diamond (Set in jewelry)
Cubic Carbon (C)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Mahogany Obsidian or Red Jasper
Silicon Dioxide with Iron Oxide (SiO2+Fe2O3)
Mineral/Igneous (Volcanic Glass)
Rose Quartz
Quartz (SiO2) with trace impurities causing pink color
Mineral
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Diamond (Set in Jewelry)
C (Native Carbon)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Bornite
Cu5FeS4 (Copper Iron Sulfide)
mineral
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Arenite (SiO2)
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Silver (Sterling Silver)
Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu
mineral
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Quartz with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Smoky Quartz (Chlorite Inclusions)
Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation
mineral
Marble
Recrystallized Limestone (CaCO3)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Leopard Skin Jasper
Chalcedony (cryptocrystalline Quartz)
Mineral
Blue Sapphire (likely lab-grown or treated)
Corundum (Aluminum Oxide, Al2O3)
gemstone
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
metamorphic
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary